Stay-bolt clutch.



PATENTED MAY 21, 1907.

W. JONES.

STAY BOLT GLUTGH. APPLIOATIOH FILED FEB. a, 1906.

WILLIAM JONES,

OF MINNEAPOLIS, MINNESOTA.

sTAY-BoLT" CLUTCH.

Specification of Letters Patent.

Patentedma 21, 1907.

Application filed February 8,1906. Serial No. 300.094.

To all whom it may concern.-

Be it known that I, WILLIAM J ONES, a citizen of the United States, residing at Minneapolis, in the county of Hennepin and State 0. Minnesota, have mvented certain new and useful Improvements in Sta -Bolt Clutches and I do l'iereb declare the ollowin to be a full, clear, an exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention has for its objectto provide an improved clutch adapted to grip and hold .menta of the improved clutch.

cylindrical bodies, and to this end it consists of the novel devices and combinations of devices hereinafter described and defined in the claims.

In the accompanying drawings which illustrate my invention, like characters indicate like parts throughout the several views. 1

Figure 1 is an elevation looking at the face Fig. 2 is a vertical section taken on the line 90 1: of Fig. 1, some parts being left in full. Fig. 3 is a transverse vertical section taken on the line a 0: of Fig. 2. Fig. 4 is a side elevation of the improved clutch, some parts being sectioned; and Fig. 5 shows a set of clutch rollers.

, The numeral 1 indicates a disk-like head having an angular shank 2, projectin back from its central portion. The hea 1 is formed with a central recess 3, with an eccentric roller seat 4, that is in reality a segmental enlargement of the seat 3., This roller seat 4, is formed with a roller engaging bearing surface 555 At the point 5 the roller engaging surface is farthest from the axis of the head '1, and central seat 3, and it gradually approaches near to the said axis in both directions and from the said point 5 toward the points 5* and 5 Within the seat 4, the head 1 is formed with a segmental retaining groove 6 that extends parallel to the roller en aging surface 555 Hardened steel 0 amping jaws 7, are firmly set in seats formed in the head 1, and extending radiall fromthe seat 3, opposite to the segl seat 4. The clutch roller 8, works in the seat 4, and is provided at one end with a small trunnion 9 that works in the'retaining groove 6 and free always to bear against the roller engaging surface 55 -5 The roller is held in working position, and its trunnion 9 is maintained in engagement with the retaining .groove 6, by means of a diskhke retaining plate 10, which is rigidly but detachably secured tothe head -1, preferably by machine screws 11. This retaining plate 10, has a central perforation 12, but the same diameter and alined with the central seat 3, of the head 1. I i

As is evident, when the roller 8 is moved in either direction from the intermediate position shown by dotted lines in Fig. 3, it will be forced nearer to. the axis of the head 1 and the seat 3,so that it will clamp a round body,

the clamping jaws 7. In Fig. 3, a round body, such as a stay bolt, is shown in section and is marked by the character Z. It is also evident that this device is a reversible clutch which is adapted to rotate a stay bolt or other body in either direction and hence is adapted for use to screw a stay bolt into its seat in a boiler or to turn the same out of its seat. It is also evidentthat the clutc will very firmly hold a bolt or other body hich is to be rotated thereby, and that the roller and cooperating jaws 7, will clamp or bite upon such body with a force which is proportionaLto the resistance which the body offers to its rotation. Otherwise stated, the greater the power required to rotate the body gripped by the clutch, the. greater will bethe biting action of the clutch thereon, so that it is impossible for the clutch to slip over a body once gripped thereby. The clutch is quick in its action and may be ver plied to, or removed from the b0 tated. V j

For clam ing bolts or bodies of different diameter, cfiltch rollers 8, of different diy to be rowhich is to be rotated by'the device, against I easily apameter may be em loyed. A set of these u rollers of different diameter is shown in Fig. 5. The one roller may be substituted for another by removing the retaining plate 10, which may, of course, be very quickly and easily done. In order that the rollers of different diameter may be used in the device described, the width of the retaining groove 6 must be considerably greater than the diameter of the trunnions 9, of said rollers. The obvious function of the retaining groove 6, is to prevent the roller, when not in action, from dropping down into the central seat 3, of the head 1.

The improved clutch above described, while adapted for a great many uses, is especially adapted and has been extensively used for screwing stay bolts into and out of boilers. The device is also particularly well, adapted to be operated by small portable pneumatic tool or other portable source of power. The clutch, so-called, is of course adapted to be used as a chuck for gripping and holding bodies of various forms for various urposes.

Y hat I claim is: v y

1. A clutch of the character described, comprising a head provided with an open recess adapted to ,receive an object to be clamped and having an eccentric roller seat that approaches more closely to the axis of said head in two directions from an intermediate point, and a clutch roller ,loose'ly mounted to freely travel on said eccentric seat and to be automatically forced thereby onto the object to be held, when the clutch is rotated in either of two directions, the reversely extended surfaces of said'roller seat, both having materially greater curvature than the said roller, substantially as described.

2. A clutch of the character described, COI1lrising a head provided with a recess and having an eccentric roller seat, a clutch roller mounted to travel on said eccentric roller seat and to be forced by said seat onto the object to be held, and a disk-like retaining plate, detachably secured to said head and perforated centrally to permit the-clutch device to be applied to the object to be clam ed thereby, substantially .as described. 3. In a clutch of the character described, the combination with a head formed with a central seat having an eccentric enlar ement affording a roller seat, said roller seat aving 5-,

' an eccentric rollefibeai'ing surface and a segmental retaining groove, of a clutch roller in said roller seat, arranged to travel over said eccentric bearing. surface and provided with a trunnion working in said retaining groove, o

and 'a roller retaining plate detachably secured to said head and provided with central perforations permittingthe clutch to be a plied to the device to be rotated or he (1 thereby, substantially as described.

4. The combination with a headl, having a central seat 3, a roller seat 4, a retaining groove 6 and clamping jaws 7, said r'olle seat 4 having an eccentric roller engaging s rface that more closely ap roaches the axisof said 50 head in two directions from its intermediate portion, of a roller 8 within said seat 4, mounted to travel over said eccentric roller engaging surface and provided with a trunnion 9, working in said retaining groove 6, and a roller retaining plate 10, detachably secured to said head 1, and provided with a central perforation 12, substantially as described.

In testimony whereof I my signature 60 in presence of two witnesses:

WILLIAM JON ES.

Witnesses: MA IE HoEL',

F. D. MERCHANT. 

